Just dropping some statistics I quickly gathered from Google Analytics, to allow developers to see what kind of specifications most current BYONDers have floating around. These figures are taken over the whole of 2011. It is worth noting, this is current website viewers only.

In each case, I'll offer top 10 results where there are more than 10.

Screen Resolution

1024x768 - 20.89%

1366x768 - 19.20%

1280x800 - 10.75%

1280x1024 - 8.85%

1440x900 - 8.00%

1600x900 - 4.92%

1920x1080 - 4.68%

1680x1050 - 4.30%

1024x600 - 2.35%

1152x864 - 2.09%

Screen Colours

32-bit - 59.18%

24-bit - 38.37%

16-bit - 2.27%

Other - 0.17%

Flash Support
Flash support is essentially ubiquitous in the statistics, there being an offering of flash versions as opposed to whether it's supported at all.

10.3 - 33.00%

10.2 - 25.88%

10.1 - 12.06%

11.1 - 6.61%

11.0 - 6.38%

Java Support

Yes - 90.32%

No - 9.68%

Operating System Type

Windows - 97.00%

Macintosh - 1.17%

Linux - 0.49%

And now a few demographics:

Country of Origin

United States - 52.07%

Brazil - 11.34%

United Kingdom - 5.91%

Canada - 4.98%

Netherlands - 1.48%

Australia - 1.46%

Poland - 1.46%

Germany - 1.03%

Philippines - 0.88%

Portugal - 0.87%

Hope this helps shape a few design decisions, for people looking to appeal to BYOND's existing userbase.

@Laserdog: I was aware of these games, but besides a few attempts to make games multi-lengual I haven't seen any successful multi-lengual games on BYOND.
And a small pointer, Brazilian is not a language. They mainly speak Portuguese in Brazil.

I don't think the language thing is all that serious. Out of the 5000 average users, we all know that about 90 to 95% of them are here for anime or fan-games. That leaves a possible 500-something players for your original game. 11% ( Brazillians ) of 500 is 55. Out of those 55 people, they have to be interested in your game to begin with. For someone like Oasis making a shooter, it doesn't seem very likely he will get many players at all as it doesn't seem like we have a huge original shooter-game audience. Just look at Decadence.

Anyway, you'd basically be making a language pack for like, a dozen or a little over a dozen people. I don't know how much work goes into a language pack, but if it's a lot, I wouldn't bother. You're better off focusing on getting games promoted outside of the site, rather than catering to a community that most likely won't care about your game.